Machine for making wood-screws.



H. P. TOWNSEND.

MACHINE POR MAKING WOOD scRBWs.

APPLICATION FILED IEB5, 1910. 1,053,244. Patented Feb.18,1913.

6 SHEETS-SHEET 1.

H. P. TOWNSEND.

MAcHxNB Pon MAKING woon sGRBws.

APPLICATION FILED I'ElL, 1910.

1,053,244. Patented Feb. 18, 1913.

6 SHEETS-SHEET 2.

COLUMBIA PLANQGRAPH co.. WASHINGTON. D. c.

H. P. TOWNSEND.

MACHINE POB MAKING WOOD SCREWS.

APPLICATION FILED 1112.5, 1910.

1 ,053,244, Patented Feb. 18, 1913.

6 SHEETS-SHEET 4` `IIIIIIIIIH nw g3@ j//V/DSTR/VEY MAW,

cnLuMBlA PLANDGBAPH Lio-.WASHINMDIL D. c.

H. P. TOWNSBND.

MACHINE FOR MAKING WOOD SGREWS.

APPLICATION FILED PEB. 5, 1910.

1,053,244. Patented Feb. 18, 1913.

Mnl/[5555 W /A/l/f/Vmf? Weg/@M coLuMBlA PLANOGRAPH co.. WASHINGTON. DAc.

H. P. TWNSEND.

MACHINE FOR MAKING WOOD SCREWS.

APPLICATION FILED 1211.5, 1910.

1,053,244. Patented Feb.1s,1913.

6 SHEETS-SHEET 6.

Mln/5555 @f7 /A/V Afm@ Immmnm PLANQGRAPH co.,w,SH1NaToN. D. c.

UNITED STATES PATENT OFFCE. HARRY P. ToWNs'END, 0E WATERERY,CONNECTICUT, AssIGN'oR To THE E. J. MAN- vILLE MACHINE COMPANY, EWATEREURY, CONNECTICUT, A CORPORATION or CONNECTICUT.

MACHINE FOR` MAKING WOOD-SCREWS.

Specification of Letters Patent.

lamented Feb. is, 1913.

i To all' whom it may concern:

Be it known that I, HARRY P. TowNsEND, a citizen of the United States,andy a resident of Waterbury, in the county of New Haven ,a'nd State ofConnecticut, have invented a new and Improved Machine for MakingWood-Screws, of which the fol-lowing is a specification.

My invention relates to the class of machines usedf for making woodscrews, that is, screws adapted to be secured in wood, and objects ofthe invention among others are to increase the rapidity of the machinein its output over prior machines, to improve the product of themachine, and generally to provide a machine having novel features ofadvantage and utility.

A- machine embodying a preferred form of construction and in the use ofwhich the objects above set out mayI be attained is-ill'ustratedin theaccompanying drawings, inwhich- Figure 1 is a view in front elevation ofthe machine with the hopper bracket broken off and parts toward the rearof the machine being omitted for sake of clearness. FigQ is a. top planview of the machine, with -the hopper bracket broken off. Fig. 3 is adetail end view looking from the left of the machine, as illustrated in1 and 2. Fig. 4 is an end view of the machine looking at the oppositeend from' that shown in Fig. 3. Fig. 5 is a detail View in frontelevation of the hopper bracket and parts supported thereon. Fig. 6(Sheet 1) is a detaily View in lengthwise central section throughthethreading tool bar. Fig. 7 (Sheet 2) is a detail view showing the mannerof adjusting the pointing tool cam- Fig. 8 (Sheet 2') is a detail Viewillustrating the relative positions of the pointing and threading toolsat certain times in the operation of the machine, and illustrating theslight movement required for the threading tool at this time. Fig. 9(Sheet 3) is a detail view in cross-section through the pointer bar andan edge view of the contact arm thereon. Fig. 10 (Sheet) is a detail topplan View of the same showing the pointing tool in place inthe bar. Fig.11 (Sheet 4) is a detail view in central longitudinal section throughthe spindle showing the jaws closed. Fig. 12 (Sheet 4) is a like viewthrough one end of the spindle sho-w ing the jaws open. Fig. 13' (Sheet4) is a detail view of the endt of the spindle. Fig. 14 (Sheet 5) is adetailv view showing the connection of theV feed blade to its supportand illustrating the operation of the guard, the blade being in itsraised position. Fig. 15 (Sheet 5) is a like view showing the blade inits lowermost position. Fig. 16 (Sheet 5) is a like view from a pointlocated at a right-angle to the point of viewv of Fig. 14. Fig. 17(Sheet 5.)r is a detail side View of the blade actuating arm. Fig. 18(Sheet 6) is a detail' view in section through the* former support andillustrating the construction and operation of the former andv threadingtool bar. Fig. 19 Sheet 6). is' a detail view illustrating the former.Figi 20 (Sheet 6) is a detail view in section through a portion of themachine showingv the back rest lever 'and its method( of mounting.' f

Figs. 21 and 22 (Sheet 6) are detail vviews illustrating the manner ofusev andf theadjustment of the back rest asfitfbecomesiWoI-n in; use.

In the accompanying drawingsthe' letterf' A denotes the fraimezof thelmachiney coni-1 structed in a manner' common 4to devices of' this classusually from cast metal',` with a bottom B'- a-rranged to rest upon andbe se'- curedf to any suitable bed or base,` commonly `a support risingfrom a pan adapted to catch the chips, work, oil, ete. This frameincludes uprights extending from the base and located in suitableposition to receive bea-rings for the cam shaft, spindle and othermovable parts, and 'also acting as a support for other portions of themachine, these uprights being preferably integrally formedy with thebase.

F @ed mecham'sm.-To secure the best results in the feed it is importantthat its members, including the hopper, hopperV blade, and its operatingmechanism,l the track and the carrier with its operating mechanism,shall all be rigidly suppo-rted and maintained in their relativepositions, so that there shall be no binding or cramping of the membersconnected to operate the mechanism or of the blanks in their movementfrom the hopper to the carrier and from the latter.

It frequently becomes necessary to adjust the carrier with respect tothe feeding fingers. Withl the parts all rigidly secured: tol av singlebracket this adjustment iseiiected; by a movementV of the bracket only,

so that a separate adjustment of different parts of the feeding deviceis not required as would be the case were they separately mounted.

In prior machines, when it becomes necessary to change the machine tooperate upon blanks of diiferentsizes the space between the sides of thetrack and other parts of the feed mechanism must be adjusted toaccommodate the different-sizes of blanks. This requires a stopping ofthe machine and considerable timeV to take down parts of the feedmechanism and replace them with other partsV of proper size. By mountingall of these parts on a single bracket which is'removably secured to themachine entire feed devices for different sizes of blanks may beassembled ready for-use, and when it is desired to change to arrange themachine for operation on a different size of blank all that is requiredis to remove the brackettures to enable the results above mentioned tobe obtained is illust-rated herein, the nuineralV 25 indicating a lugprojectingV from the side of one ofthe end uprights C to which one ofthe legs 26 of the hopper bracket 27 is removably secured, as by meansof bolts, the other leg of the bracket being secured to an upright Dextending lengthwise of the bottom B and about centrally thereof, beingjoined to the end upright E. In the `preferred form of attachment slots28 are formed in the legs of the bracket through which bolts projectinto the supports for the legs, and by this means thel bracket may beadjusted longitudinally'of the frame, and especially to bring thecarrier into position to properly deliver the blanks.

A hopper 29 is -rigidly secured to the bracket 27 preferably at one endthereof, and as a means of firmly securing the hopper a stay rod 30 withits upper end secured near the outer edge of the hopper on the sidecontaining the bearing for the hopper blade shaft and its opposite endto the end of the frame of the machine, as shown in Fig. 5, is employed.The rod at its upper end passes through a lug 31 on the inside of thehopper and is retained in position by adjusting nuts 32.

A hopper blade shaft 33 is mounted in bearings in the hopper extendingfrom the edge to a point near the center, and on the inner end of thisshaft a hopper blade 34 bottom ofthe hopper.

. The hopper blade is slotted in the usual manner, as shown in Fig. 3 ofthe drawings,

so that as it passes through a mass of the headed blanks in the hopperthe Shanks of some of these blanks will pass to the slot, the head ofthe blank overlying the edges of the slot and as the blade is projectedupward into an inclined position these blanks slide downward into thetrack to convey them to the carrier. To impart this movement to theblade a hopper blade arm 36 isy secured to the end of the shaft 33outside of the hopper. This arm is split from its 'end to va pointreaching considerably rbeyond the opening 37 for theshaft 33, and abinding screw 38 is employed to frictionally secure the arm to theshaft. A stud 39 projects from the side of the arm 36 and a bladedriving rod 40 is secured to this stud as by means of a ball joint 41while the lower end is connected by means of a ball joint 42 to a crank43 secured to the cam shaft F of the machine. The ball joints are, asplainly shown in Figs. 3, 4 and 5, formed in socketpieces to which therod 40 is removably attached.

A track consisting of, side pieces 44 is secured to the bracket 27 inany suitable manner to locate the side parts suticiently separated toreceive the shankof a blank and allow it free and easy movement alongthe track, the head of the blank overlying the upper edges of the track.A cover 45 may .be employed if desired to prevent accidentaldisplacement of the blanks from the track.

A guard 46 is secured to the edge of the blade 34 near its pivotalpoint, this guard having an opening 47 in its lower edge registeringwith the slot in the upper edge of the blade and of a size to permit thepassage of the head of a screw, as clearly shown in Fig. 16 of thedrawings. By thus locating this guard near the pivot, if any of theblanks shall lodge in improper position on the upper edge of the blade,as shown in Figs. 14 and 15, they cannot, of course, pass through theguard, and when the blade is drawn downward into the hopper in theposition shown in Fig. 15 all of the blanks thus improperly placed onthe upper edge of the blade will fall back into the hopper, as indicatedin saidigure.

All of the parts of the blade and its conend of the spindle 60 oppositethe or chuck, this tip being bored from one end forming a chamber inwhich the end of a stop rod 74 is located. This stop rod projects alongwithin the spindle and into the opening in the closer (37. An ejector 75extends into the closed end of the jaw closer and rests with its innerend against the stop rod 74, the outer end of the ejector lying inposition to receive the end of a blank and limit its movement as it ispushed in between the jaws. A spring 76 thrusting against a shoulder onthe ejector forces it toward the end of the spindle. An adjusting screw77 passes through the closed end of the tip 73 in position to engage theend of the stop rod 74, and by means of this ad justing screw thelocation of the ejector 75 is determined to accurately position thescrew blank when it is placed in the chuck. The thrust of the spring 76against the ejec tor will cause a screw blank to be thrust from betweenthe jaws when they are opened. The tip 73 is formed into a pinion 78 anda pulley 79 is secured to the spindle, by means of which it is rotatedas from a belt. This construction of the beveled aws causes them toengage the under beveled side of the head of a blank and thus force ittightly against the ejector 75. As the grips become worn and the screwsthus insecurely held, by means of the adjusting screw 77 the ejector 75may be located in a position slightly advanced, thus causing the beveledsurfaces of the heads of the blanks and of the grips to tightly engageand provision for considerable wear of the grips is thus made. The jawsbeing closed by the spring 80, slight variations in the size of theheads of the blanks in diameter would not interfere with the grippingpower, as they may be set to grip those of smaller size and the springwill accommodate them to the grip of those of larger size.

A chuck operating lever 8l is pivoted on the upper edge of the uprightl), the fork of the lever straddling the spindle and bear ing rolls 82to thrust against the opening collar 71, and the opposite end of thelever bearing a removable shoe S3 co-aeting with the chucking cam S4 onthe cam shaft F.

A feeding finger lever 85 is pivotally mounted on the hub 3G of auactuating arm rotatably mounted on a pin 37 secured in a bracket 83attached to the back of the up right D. The arm from the hub 86 projectsdownward and is operated upon by the feeding finger cani 89 to cause thefeeding lever 85 to be timely rocked to engage the feeding fingers 90with a blank on the carrier fingers 54.

The cam 89, the lever 85 and the fingers 90 are so constructed andarranged that as the lever is rocked by the cam the feeding fingersremove the blank from the carrier nection are so rigidly constructedthat there is chance for little spring action such as would cause theblade when caught by a blank and suddenly released to snap and thusthrow the blanks from the hopper. The frictional connection of thehopper blade arm 36 allows said arm to slip under the application of apredetermined force should the blade become wedged for any Cause.

A carrier bracket 48 is secured to the face of the bracket 27 and hasears 49 in which is journaled a carrier lever 50. The journals of thislever are located immediately over the point of delivery of a blank tothe feeding fingers and in close proximity thereto. This enables anextremely rigid lever to be employed, as it may be of minimum length.One end of the lever projects through an opening in the bracket 27 andis pivotally connected with a carrier operating rod 51, the lower end ofwhich straddles the cam shaft, as shown in dotted lines in Fig. 3 of thedrawings, and has a roll 52 resting in contact with the edge of thecarrier cam 53 secured to the cam shaft F. The carrier proper consistsof side parts constituting carrier fingers 54 adjustably secured to theend or base of the lever 50, this adjustment being obtained as by meansof screws 55 passing through slots in the finger bases 56, shown in Fig.5 of the drawings, so that the fingers may be adjusted toward or fromeach other to accommodate different lengths of screws.

A spindle 60 is supported at the upper edge of the upright E and anupright G, near the front of the machine. This spindle is tubular,having at its front end jaw supports 61 spaced apart a distance equal tothe thickness of the jaws 62, which are pivotally mounted between thesupports near the outer end thereof. The jaws each have a recess 63formed lengthwise thereof and on the arc of a circle in cross section, alip 64 being located at the ends of the jaws. Grips 65 are formed to titthe recesses 63, these grips being secured in place in the recesses bymeans of screws and having beveled gripping surfaces 66.

A jaw closer 67 is located within the spindle, its front end connectedby toggles G8 with the rear end of the jaws 62, so that the front endsof the jaws will be opened and closed by a lengthwise movement of thejaw closer. This jaw closer is also tubular and has near its rear end ondiametrically opposite sides`two recesses for the reception ofprojections from stops 69. These stops each have at their outer endsstop toes 70 forming stops for a collar 7l fitted about the spindle andholding the stops 69 in place. These `stops are located in slots 72formed on diametrically opposite sides of the spindle 60. A tip 73 issecured in that fingers and 1n the axis of the spindle and with theheaded end opposite the opening in the chuck and in proximity thereto.The construction and operation of these feeding fingers and theiroperating parts are of old and well-known construction and as it forms,except in connection with other elements, no part of the presentinvention, a further and detailed description will not be made herein.

A plate 91 is secured to the top edge of the upright C and theintermediate upright H of the frame. rllwo slide brackets 92, oppositelyarranged and having lips at their upper edges (see Fig. are supported onthis plate, and shoes 93 are located to slide on the plate between itand said lips. A rocker 9-1 having a pusher 95 is mounted on a pin7 theopposite ends of which are cured in the shoes 93. The end of the pusheris bent downward (see Fig. l) in position to engage the end of a blankand force it between the grips of the chuck jaws. the feeding lingersbeing withdrawn from the blank when the latter is located between thegrips.

A pusher lever 90 is pivotally mounted on the plate 91, one end of thelever being located in a recess in the upper edge of the rocker and theother end of the lever engaging with a pusher cam 9T secured to the camshaft F. A rest 92'() receives the pusher at the lower limit of itsrocking movement. The construction and operation of this pushermechanism is one well-known and will be readily understood by thoseskilled in the art and a further detailed description is thereforeomitted herein.

A back rest bracket 9S is secured to the longitudinal upright D, as bymeans of screws passingv through openings 99 in the back rest and largerin diameter than the screws, so that the bracket may be adjusted indifferent directions. The bracket is mounted for an adjustable turningmovement on a pin 100 secured in the upright, and by loosening thefastening screws the bracket may be tipped for adjustment in differentdirections. A back rest arm 101 is mounted on a taper pin 10Q secured inthe side parts of the back rest, the arm having at its upper end a clampplate 103 for a back rest 10i. which has a recess to receive the screwblank.y as shown in Fig. Q0of the drawings. y the thrust of thc pointingtool is upward and when the back rest becomes worn. as illustrated bydotted lines in Fig. 21, by tipping the bracket on the pin 100 as apivotal point, the back rest may be brought into the position sho vn inFig. QQ and the screw blank may thus be always maintained in ahorizontal position, thus insuring accurate work although the back restbecomes worn place it in position with its ends As shown in said ligure.

in use. It will be noted that the arm 101 closely fits between the sideparts 155 of the bracket, which side parts project well t0- ward theupper end of the arm,thus preventing chips, dirt and like material fromgetting behind the arm and obstructing its movement.

A backward extending projection 105 from the upper part of the back restbears a shoe 106 in engagement with a back rest cam 107 on the cam shaftF, which cam allows the back rest to be moved away from the blank at thetimes when it is being pushed into the chuck and being ejectedtherefrom.

The threading' mechanism forms an important feature of my invention andit is so constructed that the final and accurate adjustments of thethreading tool are obtained by adjustment of a former shoe which is veryaccessibly located at the front of the machine so that the threadingtool may be easily maintained in true position. Parts of the niechanismare moved in one direction bv the action of calns and in the oppositedirection by springs, and in order to cause no undue strain or on any ofthe parts a single spring is employed to return each of said parts. Inprior constructions a single spring has been employed to force thethreading tool bar toward its chasing cam7 to hold its contact memberagainst its forming shoe and to hold its actuating lever against itscam, this spring being diagonally arranged to exert a pull downward andlongitudinally of the bar. The force of the down ward pull to accomplishits purpose caused an excessive pull lengthwise of the bar, with aconsequent injury to parts thus operated upon. lly making` the threadingtool bar hollow its weight is greatly reduced, thereby etl'ectuallyreducing shock and consequent injury therefrom. At the same time thishollow bar is utilized as an inclosure for one of the springs. Theconstruction of this threading mechanism is also such that any errorcaused by inaccuracy in di ti'erent working faces of the actuating camor wear in the bearings are so reduced and minimized at the tool pointas to be practically n/Z, the actuating lever being comparatively longas compared with the length of the tool post and the latter thus beingstiff and rigid with practically no spring action. Such constructionenables the tool to be setk to take the full depth of cut determined byany working face of the cam against which the lever maj.v rest when thetool is being adjusted and this without danger of another working facecausing such depth of cut as to hold the blank and cause the chuck jawsto slip. This enables the full cutting capacity of the machine to bealways obtained and at a minimum number of operations of the cuttingtool.

l this curve of the shoe being of considerably larger radius, vand thefollow pin 119 being proportionately increased so that the propermovement will be given to form the point on the screw. This forming shoeis located at the front of the machine in a position where it is readilyaccessible and in adjusting the threading tool the latter isapproximately positioned by means of adjustment of the tool post on thethreading tool bar. The fine adjustment of said tool is then obtained byadjusting the forming shoe to impart to the threading tool the correctmovement laterally A chasing cam shaft 108 is mounted in the uprights Eand G and below the spindle 60, the end of this shaft extending outsidebeyond the upright E. A chasing cam 109 l is secured to this shaft andis arranged to engage the tip 110 of a threading tool bar 111, mountedin bearings in the uprights C, H and G. This bar projects beyond theupright G just sufficiently to permit its longitudinal movement withoutmoving the tip into the bearing, and this allows the chasing cam 109 tobe located so close to the bearing that there is no cramping action onthe bar laterally of its axis. A bushing 112 is mounted in the upright Gto receive the blows of a collar 118 rigidly clamped to the bar 111. Thebar 111 is hollow as shown in Fig. 6 and contains at one end a plunger114 seated against a spring 115, the opposite-end o-f the springthrusting against the bar, as shown herein, the thrust being received bythe tip 110. This causes the bar to be forced normally toward the cam109. The shock of the blow delivered by this spring, however, is notsustained by the cam but by the bushing 112, the movement of the bartoward the cam being stopped by the collar 113 against this bushing.This prevents the shock of the movement of the bar from being deliveredupon the cam with the consequent injury thereto, A stop plate 116secured to the edge of the plate 91 serves to limit the movement of thethreading tool bar away from the chasing cam.

A tool post 117 is secured to the bar 111 as by means of a set screw,this post being of a width and thickness as compared with the length ofthe post to avoid any spring action, the post in fact being very short,as shown in Fig. 1 of the drawings. A threading tool 118 is secured tothe tool post in any suitable manner. A follow pin 119 is adjustablysecured in a follow pin support 120, adjustably clamped to the threadingtool bar 111, as clearly shown in Fig. 18 of the drawings, the clampscrew 121 permitting rotary adjustment of the support upon the threadingtool bar and the clamp screw 122 permitting rotary adjustment of the pin119 with respect to a forming shoe 123.

A former lever 124 is pivotally mounted on the threading tool bar 111,one end of the lever being formed to engage with a former cam 125secured to the cam shaft F. The opposite end of the lever is provided asa support for the forming shoe 123 which shoe is mounted upon adjustingscrew rests 126 in the bottom of the support and screws 127 locating theplate in a direction length- WiSe 0f the threading i001 bal'. The upperagainst the blank while the pointing tool is edge of the forming shoe isformed to cordoing its work. and the threading tool and respond with thecurve of the pointto be pointing tool may thus be at work simulgiven tothe screw made in the machine, but t taneously. When the rotations ofthe blank of the axis of the screw. Tn case it shall be found that thethreading tool is not properly positioned lengthwise of the bar to causethe threading tool to move inward at the proper time, a fine adjustmentto obtain this result may be had by adjusting the shoe lengthwise bymeans of the screws 127.

The pin 119 may be turned in its bearing whenever it becomes worn andany. wear in the shoe and pin may be readily compensated for by means ofthe screws 126 and 127. A spring 128 holds the pin 119 in contact withthe shoe 123 and a spring 129 having one end secured to the lever 124and itsother end to a fixed part of the machine, holds the lever againstthe former cam 125.

Tt will be noted that the chasing cam shaft 108 is comparatively short.having its bearing at the outer end located in a gear casing to behereinafter described. and that by simply removing this gear casing theshaft may be easily drawn out at this end of the machine.

The chasing cam is made reversible, each side constituting a workingface of the cam. so that each chasing cam may be adapted for operationto impart different degrees of movement to the threading tool bar or formoving said bar at different intervals of time. This removable featureof the chasing cam shaft is of especial advantage where it is desired tofrequently change the chasing cam in making screws of different sizes.

The pointing tool is borne upon a pointing tool bar traveling parallelwith the axis of the spindle. this pointing tool being comparativelvthin. The threading tool is therefore required to move back but a shortdistance to clear the pointing tool.y and the return movement of thelatter can therefore take place close to the screw blank. thus savingtime in the operation of the threading tool and also saving wear in therotary movement of the threading tool bar. AThe relative position of thetwo tools is shown in Fig. 8 of the drawings. This construction allowsthe back-rest to be brought up in a single pass of the threading toolare not sutlicient to enable the pointing tool to complete its Work thethreading tool may be caused to make one or more idle passes until thepointing operation has advanced suthciently, when the threading tool isbrought int-o operation, beginning its Work as above described beforethe pointing tool has completed its Work.

The pointing tool bar 130 is arranged for longitudinal reciprocation inbearings 131 rising from the plate 91, the pointing tool 132 beingsecured in the end of this bar. A. pointing tool arm is adjustablymounted on the bar, the end of the arm bearing1 a rest 134, as hereinshown this being a screw adjustably mounted and Which slides upon apointing tool plate 135 secured to the plate 91. The pointing tooloperating lever 13G is pivotally mounted upon the plate 91, one end ofthe lever bearing an adjusting contact screw 137 arranged to engage thearm 133 to reciprocate the pointing tool bar. The opposite end of thelever bears a tocpiece 138 adjustably mounted therein and which engagesa cam 139 mounted on a cam disk 140 secured to the cam shaft F. rl'hiscam has slots 141 to receive screws 142 by means of which the cam isadjustably mounted on its disk. This adjustable mounting of the camprovides means hertV`- by the speed of the cam shaft may be in creasedWithout increasing the rate of movement of the pointing tool.

The change speed gears connecting the several shafts are so arranged atthe end of the machine that the studs upon which they are mounted Willnot limit the size of gears borne by other parts. In a common form ofconstruction in use at the present time the studs for the connecting orchange speed gears are mounted on the machine frame, and such locationlimits the size of gears that may be used upon some of the shafts, andespecially upon the cam shaft. By attachment of a gear stud to the gearcase the gears upon the shafts, and especially upon the cam shaft, maybe of a size to project beyond the bearing stud, thus allowing the useof gears of any suitable size.

The gear case 143 is removably secured to the end of the machine as bymeans of screws, all the gears and pinions at the end of the machinebeing thus inclosed. The cam shaft F and the chasing cam shaft 10S aredriven from the spindle 60 by means of intermeshing gears, the saidspindle being driven, as hereinbefore explained, as by means of a beltpassing around the pulley 79.

Bearing plates 144 are secured to opposite faces of the gear case,closing an opening 145 therein, these plates being securely andadjustably held by means of a nut applied to the end of a shoulderedbearing stud 146. This stud bears a chasing cam change speed gear 147and pinion 148, the former meshing ivith the pinion 78 on the spindle,and the latter with a chasing cam shaft gear 14.() secured to thechasing cam shaft 108, thisv forming the driving connection for thechasing cam shaft. The end of this shaft is mounted in the gear case andextends through an enlarged opening in the frame. The driving pinion15() for the cam shaft is secured to the chasing cam shaft, this pinionmeshing with the cam shaft change speed gear 151 mounted on a cam shaftchange speed gear stud 152 secured to the frame of the machine. A canishaft change speed pinion 153 is secured to the change speed gear 151and meshes with a cam shaft gear 1.54 secured to the cani shaft 1t"through which pinion the cam shaft is driven.

lt Will be noted that the gear 154 projects beyond the end of the stud146, thus allowing a larger gear to be used on the cam shaft than couldbe used if the stud 146 were secured to the frame of the machine, and atthe same time locate the cam shaft gear close to the bearing of the camshaft, thus avoiding any spring action in the cani shaft.

I claims 1. A spindle, means carried by the spindle to hold an article,means for operating the spindle, a tuliular tool carrying bar to operateon an article carried by the spindle, means for moving the bar in onedirection, a striking tip inserted in one end of the bar, a plungerlocated in the opposite end of the bar. a spring located between andthrusting against said tip and plunger, and means for receiving thethrust of the plunger.

A spindle having means to article to be threaded, means the spindle, athreading tool bar to receive a tool for threading said article, aforming shoe having a curved surface to conform to the degree of curveof the point on said article, the curve of the shoe having a muchgreater radius than the point of the article being formed, and afollow-pin having a curve to conform to the curve of said shoe.

A spindle having means to hold an article to be threaded, means foroperating the spindle, a threading tool bar to receive a tool forthreading' said article, a forming shoe having a curved surface toconform to the degree of curve of the peint on said article, the curveof the shoe having a much greater radius than the point of the articleto be formed, and a follow pin to engage said shoe.

4. A spindle having means to hold an article to be threaded, means foroperating the spindle, a shoe having a curved surface to conform to thecurve of the point on said article, a follow-pin carried by the bar andround in cross-section to conform to the curve of said shoe, and meansfor adjusting the follow-pin in a rotary direction.

hold an for operating 5. In a tooling machine, a spindle having means tohold an article, means for operating the spindle, a pointing tool harmounted for rotary movement and longitudinal movement in a direction thesame as the aXis of the spindle, a pointing tool arm secured to saidhar, a rest to support said pointing tool arm, a pointing tool leverpivot ally mounted, a contact secured in one end of said lever to engagethe pointing tool arm, and a cam engaging the opposite end of said leverto move the pointing tool bar longitudinally.

6. A frame, a spindle mounted in the frame and having means to hold anarticle, means for operating the spindle, a tool holding bar mounted inthe frame in cooperative relation with said spindle, a chasing cam shaftbearing a reversible cam to operate said tool holding bar, means fordriving the cam shaft, and a gear case secured to the end of the machineand having an opening for a h airing for the end of said cam shaft andto permit its removal.

7. A frame, a spindle mounted in the frame and having means to hold anarticle,

means for operating the spindle, a tool holding har mounted in the framein cooperative relation With said spindle, a chasing cam Ishaft bearinga cam to operate said tool holding bar, gears located at the end of themachine for connecting said spindle and shaft, and a gear case securedto the end of gears and having ,said cam shaft the the machine to coversaid a hearing for the end of which projects through an opening 1n endof the frame.

8. A frame, a spindle frame and having means to hold an article, meansfor operating the spindle, a tool car rying har mounted in the frame incoperamounted in the move its point of support t the screvv toward tiverelation with said spindle, a cam shaft `.nounted in the frame bearing acam to perate said tool holding bar, a chasing cam shaft having one endmounted in the frame and its opposite end extending through an openingtherein, a` train of gears located at the end of the frame forconnecting said shafts, said train including a change speed gear mountedupon a stud, and a gear casing secured to the end of the frame andinclosing said gears, said casing containing a bearing for the chasingcam shaft and also supporting said change gear stud.

il. A frame, a spindle mounted in the frame and having means to hold anarticle, means for operating the spindle, a tool to operate upon saidarticles, a` cam shaft connected vvith said tool to operate it, achasing cam shaft to operate said tool, a train of gears located at theend of the machine to connect said shafts and spindle, said trainincluding a change speed gear, a stud hearing said gear, and a gearcasing secured to the end of the frame and inclosing said gears, saidchange gear stud being secured to the casing and providing an opening between the end of the stud and the frame of the machine.

10. A spindle having means to receive a screvv, means for operating thespindle, a tool to cut said screw. means for operating the tool. ahack-rest adapted to support the screvv during the cutting operation,and means for adjustaloly tilting the back-rest to for the pointof andaway from the latter.

H ARRY P. TOVNSEND.

lVitnesses JAMES J. CAFFRnY, N. W. CUMMINS.

Copies of this patent may be obtained for ive cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

